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Shell Programming and Scripting
Time taken to run grep in different OS
Post 302835825 by Skrynesaver on Tuesday 23rd of July 2013 04:59:51 AM
07-23-2013
OS is a factor, as is filesystem, amount of free memory (esp. for Linux's read ahead ), I recommend faster disk storage or flash drives if you want to read files faster 
grep is a pretty optimised command as it is...
Edit: Actually, on the locale issue, make sure "LC_COLLATE=Posix" if you're using ranges in grep.
grep is a pretty optimised command as it is...
Edit: Actually, on the locale issue, make sure "LC_COLLATE=Posix" if you're using ranges in grep.
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LEARN ABOUT REDHAT
bzgrep
BZGREP(1) General Commands Manual BZGREP(1) NAME
bzgrep, bzfgrep, bzegrep - search possibly bzip2 compressed files for a regular expression SYNOPSIS
bzgrep [ grep_options ] [ -e ] pattern filename... bzegrep [ egrep_options ] [ -e ] pattern filename... bzfgrep [ fgrep_options ] [ -e ] pattern filename... DESCRIPTION
Bzgrep is used to invoke the grep on bzip2-compressed files. All options specified are passed directly to grep. If no file is specified, then the standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and fed to grep. If bzgrep is invoked as bzegrep or bzfgrep then egrep or fgrep is used instead of grep. If the GREP environment variable is set, bzgrep uses it as the grep program to be invoked. For example: for sh: GREP=fgrep bzgrep string files for csh: (setenv GREP fgrep; bzgrep string files) AUTHOR
Charles Levert (charles@comm.polymtl.ca). Adapted to bzip2 by Philippe Troin <phil@fifi.org> for Debian GNU/Linux. SEE ALSO
grep(1), egrep(1), fgrep(1), bzdiff(1), bzmore(1), bzless(1), bzip2(1) BZGREP(1)